its possible to use adblocker for this, here is a short guide:
google adblock, get extension for ur browser.
start a game
when opponent shows up, right click in the area of his name, go to adblock -> block this ad
slide the slider until the rating is gone.
you only need to do this once. if you wish to make ratings visible again, go to adblocker options and remove chess.com
I get the point of trying to improve and overcoming weakness whatever; however, people want to play for fun too and not have to worry about rating. Obviously if you think differently that's your opinion and not mine!